/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package org.apache.hc.client5.http.entity.mime;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;

import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.HeaderElement;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.NameValuePair;
import org.apache.hc.core5.http.message.BasicHeaderValueParser;
import org.apache.hc.core5.http.message.ParserCursor;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

class TestMultipartFormHttpEntity {

    @Test
    void testExplicitContractorParams() {
        final HttpEntity entity = MultipartEntityBuilder.create()
                .setLaxMode()
                .setBoundary("whatever")
                .setCharset(StandardCharsets.UTF_8)
                .build();

        Assertions.assertNull(entity.getContentEncoding());
        final String contentType = entity.getContentType();
        final HeaderElement elem = BasicHeaderValueParser.INSTANCE.parseHeaderElement(contentType,
                new ParserCursor(0, contentType.length()));
        Assertions.assertEquals("multipart/mixed", elem.getName());
        final NameValuePair p1 = elem.getParameterByName("boundary");
        Assertions.assertNotNull(p1);
        Assertions.assertEquals("whatever", p1.getValue());
        final NameValuePair p2 = elem.getParameterByName("charset");
        Assertions.assertNull(p2,
                "RFC7578 does not mention charset parameter for Content-Type, " +
                        "so no charset should be present for MultipartEntity.getContentType()");
    }

    @Test
    void testImplicitContractorParams() {
        final HttpEntity entity = MultipartEntityBuilder.create().build();
        Assertions.assertNull(entity.getContentEncoding());
        final String contentType = entity.getContentType();
        final HeaderElement elem = BasicHeaderValueParser.INSTANCE.parseHeaderElement(contentType,
                new ParserCursor(0, contentType.length()));
        Assertions.assertEquals("multipart/mixed", elem.getName());
        final NameValuePair p1 = elem.getParameterByName("boundary");
        Assertions.assertNotNull(p1);

        final String boundary = p1.getValue();
        Assertions.assertNotNull(boundary);

        // "httpclient_boundary_" + UUID (32 characters + 4 dashes) + 56 characters
        Assertions.assertEquals(56, boundary.length());
        final NameValuePair p2 = elem.getParameterByName("charset");
        Assertions.assertNull(p2);
    }

    @Test
    void testRepeatable() throws Exception {
        final HttpEntity entity = MultipartEntityBuilder.create()
                .addTextBody("p1", "blah blah", ContentType.DEFAULT_TEXT)
                .addTextBody("p2", "yada yada", ContentType.DEFAULT_TEXT)
                .build();
        Assertions.assertTrue(entity.isRepeatable());
        Assertions.assertFalse(entity.isChunked());
        Assertions.assertFalse(entity.isStreaming());

        final long len = entity.getContentLength();
        Assertions.assertEquals(len, entity.getContentLength());

        ByteArrayOutputStream out = new ByteArrayOutputStream();
        entity.writeTo(out);
        out.close();

        byte[] bytes = out.toByteArray();
        Assertions.assertNotNull(bytes);
        Assertions.assertEquals(bytes.length, len);

        Assertions.assertEquals(len, entity.getContentLength());

        out = new ByteArrayOutputStream();
        entity.writeTo(out);
        out.close();

        bytes = out.toByteArray();
        Assertions.assertNotNull(bytes);
        Assertions.assertEquals(bytes.length, len);
    }

    @Test
    void testNonRepeatable() {
        final HttpEntity entity = MultipartEntityBuilder.create()
            .addPart("p1", new InputStreamBody(
                new ByteArrayInputStream("blah blah".getBytes()), ContentType.DEFAULT_BINARY))
            .addPart("p2", new InputStreamBody(
                new ByteArrayInputStream("yada yada".getBytes()), ContentType.DEFAULT_BINARY))
            .build();
        Assertions.assertFalse(entity.isRepeatable());
        Assertions.assertTrue(entity.isChunked());
        Assertions.assertTrue(entity.isStreaming());

        Assertions.assertEquals(-1, entity.getContentLength());
    }

}
